[Issue 21151] div bug: long -5000 / size_t 2 = 9223372036854773308

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21151

--- Comment #3 from mw <mingwu at gmail.com> ---
Just because C++ did it doesn't means it's correct.

And D supposed to be an improvement of C++.

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